resumo
This work describes the synthesis of ZnS powders in high yield and via a straightforward process, under ambient conditions (temperature and pressure), by adding to aqueous zinc (II) a nutrient solution containing biologically generated sulfide from sulfate-reducing bacteria (SRB). The powders obtained as above were composed mainly of ZnS (sphalerite) nanoparticles (NP's) exhibiting a spheroidal morphology (20-30 nm). The NP's morphological properties and crystalline phase were not markedly altered by the SRB growth media composition neither by the presence of bacterial cells. The relevance of this method to obtain ZnS supported solid substrates has been demonstrated by performing the synthesis in the presence of TiO2 and SiO2 submicron particles. (C) 2012 Elsevier B.V. All rights reserved.
palavras-chave
SULFATE-REDUCING BACTERIA; BIOGENIC SULFIDE; RAMAN-SPECTRA; WASTE-WATER; NANOPARTICLES; PRECIPITATION; ZINC; BIOREMEDIATION; SPHERES; GROWTH
categoria
Metallurgy & Metallurgical Engineering
autores
da Costa, JP; Girao, AV; Lourenco, JP; Monteiro, OC; Trindade, T; Costa, MC
nossos autores
Ana Violeta Girão
Investigador Júnior
João Miguel Martins Novaes Pinto da Costa
Bolseiro de investigação
Tito Trindade
Professor CatedráticoGrupos
G1 - Materiais Porosos e Nanossistemas
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
Funding by Fundacao para a Ciencia e a Tecnologia (FCT) through a PhD grant (SFRH/BD/43784/2008) is acknowledged. A. V. Girao also thanks FCT for the Post-Doc grant (SFRH/BPD/66407/2009).